Looking for one as well. My gh actions broke and looking for a drop in replacement.
Got this working with claude, would love if someone with more knowledge had thoughts:
```bash
# Extract branch name from GITHUB_REF or GITHUB_HEAD_REF
echo "current_branch=${GITHUB_HEAD_REF:-${GITHUB_REF#refs/heads/}}" >> $GITHUB_OUTPUT
# Determine if this is the default branch
if [[ "${GITHUB_REF#refs/heads/}" == "${GITHUB_REF_NAME}" && "${GITHUB_REF_NAME}" == "${GITHUB_BASE_REF:-${GITHUB_REF_NAME}}" ]]; then
echo "is_default=true" >> $GITHUB_OUTPUT
else
echo "is_default=false" >> $GITHUB_OUTPUT
fi
# Set default branch name
echo "default_branch=${GITHUB_BASE_REF:-${GITHUB_REF_NAME}}" >> $GITHUB_OUTPUT
```